.logo{
    margin-left: 400px;
    width: 200px;
}
/* banner */
.banner {
    height: 500px;
  }
  
  .banner .wrapper {
    position: relative;
    height: 500px;
    overflow: hidden;
  }
/* 底部 */
.footer {
    height: 200px;
    background-color: #F5F5F5;
  }
  /* 版权 */
.copyright {
    text-align: center;
  }
  
  .copyright p {
    margin-bottom: 10px;
    color: #A1A1A1;
  }
  
  .copyright p a {
    margin: 0 10px;
    color: #A1A1A1;
  }